Connecticut State Police said Sunday that officers were responding to an emergency call on Friday reporting a possible domestic incident involving John Valluzzo, head of the Military Museum of Southern New England in Danbury.

Authorities say a Ridgefield police officer opened fire after the 75-year-old Valluzzo refused to obey orders to put down his handgun and instead raised the weapon toward police. He was declared dead at Danbury Hospital.

State police are investigating the circumstances at the request of the Danbury state's attorney and Ridgefield police.